Drive health is improperly messaged when parity is invalid

On the Dashboard, under the Array section, a critical error is displayed stating "Array has N failed device" if the parity is invalid (where N is the number of parity disks), regardless of the device's actual health. On an initial parity sync of a new array, the error message should be that the parity is invalid, not that a device has failed. A failed device insinuates a drive has failed.

Steps to recreate the issue:

1. Configure a new Unraid installation as default. This particular installation case has four drives: two 3TB drives and two 2TB drives.

2. Under the Main tab, configure one of the 3TB drives as the parity drive. Configure the other three drives as data drives.

3. Start the array. (The parity drive will be formatted at this point, as expected.)

4. Confirm disk formatting and format the data disks.

5. When the disk formatting completes, start the first parity sync operation.

6. Go to the Dashboard and find the Array section. Parity status reads "invalid," and a critical error message stating that the array has 1 failed device is displayed in red. SMART status for the disk reads "healthy."

Expected behavior:

1. Configure a new Unraid installation as default, configure the parity drives and the data drives, start the array, and format the data drives.

2. When the drive formatting completes, start the first parity sync operation. Confirm that the parity drive is in a vulnerable state (amber exclamation next to that disk).

3. Go to the Dashboard and find the Array section. Parity status should read "invalid", and a warning message stating that the array is vulnerable is displayed in amber. SMART status for the disk reads "healthy."